GB/T 21447-2018 Translated English of Chinese Standard. (GBT 21447-2018, GB/T21447-2018, GBT21447-2018): Specifications for steel pipeline external corrosion controlhttps://www.chinesestandard.net, 2018 M10 5 - 33 pages This Standard specifies the minimum requirements for the design, construction, and management, etc. of steel pipeline external corrosion control engineering, including basic provisions, anticorrosion coating design, cathodic protection design, interference mitigation, construction and acceptance, operation and maintenance management, and other contents. This Standard is applicable to the external corrosion control of oil, gas, and water pipelines, which are newly-built, expanded, and re-built overland and subsea, with conveying medium temperature of less than 100 Celcius. |
Contents
| 3 | |
Scope | 5 |
Terms and definitions | 6 |
Basic provisions | 8 |
Anticorrosion coating design | 10 |
Cathodic protection design | 13 |
Interference mitigation | 18 |
Construction and acceptance | 23 |
Operation and maintenance management | 27 |
Corrosion control records | 28 |
Common terms and phrases
AC interference degree AC interference mitigation Austenitic buried and underwater buried pipeline buried steel pipeline cable cathode potential Cathodic protection criteria cathodic protection design cathodic protection potential cathodic protection system Coal tar coating for buried coating of pipeline coating shall comply construction and acceptance copper sulfate corrosion control measures corrosion rate test drop-free electric isolation engineering epoxy anticorrosion coating evaluated external anticorrosion coating external corrosion control fusion bonded epoxy galvanic anode GB/T hydrogen embrittlement insulation coating interference mitigation measures interference source interference voltage Limiting critical potential maintenance management Martensitic meet the requirements minimum protection potential natural potential Overland pipeline PetroChina pipe-to-soil potential pipeline anticorrosion coating pipeline external corrosion polypropylene protection of cathodic provisions of SY/T provisions of Table relevant provisions repaired mouth soil and water soil resistivity Specification splash zone stainless steel Standard steel pipeline SY/T stray current subsea pipeline anticorrosion test piece thermal insulation underwater pipelines water environment